## Decimal Division Around the World

Following are links to Internet resources that can be used to support instruction of the Math World feature for this chapter.

U.S. Metric Association
This site promotes the use of the metric system in the United States and offers conversion tables and much more information about the International System of Units, including NCTM standards regarding the metric system and metric teaching supplies.
http://lamar.colostate.edu/~hillger/

The United States and the Metric System
This National Institute of Standards and Technology provides this site with some history of the metric system, common questions, and some useful graphics that help teach the relationships between metric and customary measures.
http://ts.nist.gov/ts/htdocs/200/202/lc1136a.htm

IAAF Legends: "Fanny" Blankers-Koen
The International Amateur Athletic Association provides this page about the legendary athlete Francine Blankers-Koen. You may wish to visit the World Records listing on the Results and Stats pages to compare her winning time for the Womens' 200 meter race with current record holders. Compare the world record winning times of a short distance race to that of a longer distance race that is a multiple of the short di stance (for example, 200-meter and 800-meter races). How long does running 200 meters take in the longer race? Divide decimals to compare the times.
http://www.iaaf.org/index.asp

Rod Numerals (Counting Rods)
The Chinese used counters and counting rods for recording measurements and calculating, and used a decimal place-value system. Learn more about the Chinese Rod Numerals by visiting additional pages at the History of Math Web site at Simon Fraser University in Canada.
http://www.math.sfu.ca/histmath/China/Beginning/Rod.html

The Metric System (SI)
Gordon Speer presents information about the metric system at his Web site, including some prefixes for extremely large and small units.
http://www.essex1.com/people/speer/metric.html

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